CN106525710A

CN106525710A - Electrochemical testing device for acoustic-emission-testing-material corrosion performance and application method thereof

Info

Publication number: CN106525710A
Application number: CN201611178470.2A
Authority: CN
Inventors: 徐连勇; 张志强; 韩永典; 荆洪阳; 赵雷
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2016-12-19
Filing date: 2016-12-19
Publication date: 2017-03-22
Anticipated expiration: 2036-12-19
Also published as: CN106525710B

Abstract

The invention discloses an electrochemical testing device for the acoustic-emission-testing-material corrosion performance and an application method thereof. The electrochemical testing device comprises an electrolytic tank, an electrochemical testing device, a heating device and a heat preservation device. The electrolytic tank comprises a reaction tank, a reaction tank cover, a sealing gasket, fastening devices and a sample installing device; the sample installing device is composed of a stepped screw wave-guiding rod, a primary sleeve, a secondary sleeve, a tertiary sleeve, a sealing ring and an acoustic emission sensor; the electrochemical testing device comprises an auxiliary electrode clamp, a reference electrode clamp, a working electrode clamp and an electrochemical data processing system, an auxiliary electrode is a platinum net electrode, a reference electrode is installed in a luggin capillary, the heating device is arranged on the outer side of the reaction tank, and the heat preservation device is arranged on the outer side of the heating device. According to the electrochemical testing device for the acoustic-emission-testing-material corrosion performance and the application method thereof, the acoustic emission dynamic nondestructive testing technology and the electrochemical testing technology are integrated, and online, dynamic and real-time testing of the electrochemical corrosion process of a material is achieved.

Description

A kind of electrochemical testing device of acoustic emission detection material corrosion performance and its use Method

Technical field

The present invention relates to material corrosion performance test device field, and in particular to a kind of acoustic emission detection material corrosion performance Electrochemical testing device and its using method.

Background technology

Corrosion is a kind of slow damage process that material occurs in harsh Service Environment, with extremely strong disguised, idol So property, it is sudden and serious destructive the features such as.Electrochemistry is a kind of conventional Fast Evaluation material corrosion resistance Method of testing, such as potentiodynamic polarization, constant potential polarization, circulation potentiodynamic polarization, electrochemical impedance test etc..Electrochemical techniques master The destructive detection of small sample is directed to, it is therefore intended that prior prediction corrosion proof to material or after-action review, but cannot to Labour large-scale component corrosion condition carries out on-line checking.Acoustic emission is a kind of highly sensitive online Dynamic Non-Destruction Measurement.With The related passivating film cracking of corrosion, bubbles burst, stress corrosion cracking etc. are typical acoustic emission sources.Current acoustic emission is It is successfully applied to the fields such as remote conveying oil-piping leak detection, Corrosion of Tanks degree online evaluation.But during corrosion damage The application study of sound emission mechanism harmony transmitting qualitative assessment extent of corrosion is still within the starting stage.Sound is adopted while existing Lift-off technology and electrochemical techniques detect that the major defect of the test device of material corrosion performance is：(1) traditional test device The tested sample size of requirement is too big, it is impossible to carry out the test of tiny sample.While tested sample is contacted with corrosive medium also Requirement has enough areas with waveguide rod or directly with acoustic emission sensor is connected, and this requires that the size of tested sample must set That what is counted is sufficiently large.Welding point is typically structural member link the weakest, if it is desired to the zones of different (weldering of Welded Joints Seam root, capping, Weld pipe mill, high temperature and low temperature heat affecting etc.) sound emission and Electrochemical Detection are carried out, the limit based on sampling System, existing test device cannot be realized；(2) for the ease of the installation of acoustic emission sensor, tested sample is used as work Electrode is usually required to be mounted at the bottom of electrolytic cell, therefore existing test device limits the heating to corrosive medium and guarantor Temperature；(3) acoustic emission detection and Electrochemical Detection of material corrosion performance under various mixed gases environment cannot be simulated；(4) sample The complex operation of installation and removal.

The content of the invention

It is an object of the invention to overcome the deficiencies in the prior art, there is provided a kind of specimen holder for electrochemical corrosion test Tool and its using method；

The present invention also aims to provide a kind of fixture and its using method of acoustic emission detection material corrosion performance；

Another object of the present invention also resides in a kind of corrosion electrochemical test system of offer and its using method；

Another object of the present invention also resides in the electro-chemical test dress for providing a kind of acoustic emission detection material corrosion performance Put and its using method.

For the sample clamp of electrochemical corrosion test, by ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level Sleeve and sealing ring composition, ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve and sealing ring are coaxially disposed, its In：Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, and the first external screw thread is connected with the internal thread of one-level sleeve, So that the front end of ladder screw thread waveguide rod is placed in first cavity and the second cavity of one-level sleeve, the second external screw thread is placed in one-level On the outside of second cavity of sleeve；In the rear end of ladder screw thread waveguide rod, fixing end is set；One-level sleeve external screw thread and three-level sleeve Internal thread is connected, so that one-level sleeve is placed in the 3rd cavity and the 4th cavity of three-level sleeve；Two-level sleeve is sleeved on three-level On the outside of sleeve, sealing ring is set between two-level sleeve and three-level sleeve.

In above-mentioned technical proposal, the sealing ring is rubber seal.

In above-mentioned technical proposal, a diameter of 5 ± 0.01mm of the test surfaces of sample, length are 7～8mm.

In above-mentioned technical proposal, ladder screw thread waveguide rod be metal material, such as ferritic stainless steel.

In above-mentioned technical proposal, one-level sleeve, two-level sleeve, three-level sleeve are insulating materials, such as polytetrafluoroethyl-ne Alkene.

When being used, ladder screw thread the second external screw thread of waveguide rod is connected with the internal thread of sample, in the circumference of sample Face arranges coupling oxidant layer, rotates the fixing end of ladder screw thread waveguide rod, so as to be connected with ladder screw thread the second external screw thread of waveguide rod Sample test surfaces, it is concordant with the second alignment surface of the first alignment surface of one-level sleeve, three-level sleeve；Using second sleeve Internal thread is fixedly linked with test device, and carries out electrochemical corrosion test to sample, with sample as working electrode, using wire It is connected with the ladder screw thread waveguide rod on the outside of test device, to gather the electrochemical corrosion signal on sample.

The fixture of acoustic emission detection material corrosion performance, by ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level Sleeve, sealing ring and acoustic emission sensor composition, ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing Circle and acoustic emission sensor are coaxially disposed, wherein：Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, outside first Screw thread is connected with the internal thread of one-level sleeve, so that the front end of ladder screw thread waveguide rod is placed in the first cavity of one-level sleeve and In two cavitys, the second external screw thread is placed on the outside of the second cavity of one-level sleeve；Arrange in the rear end of ladder screw thread waveguide rod and fix End, arranges the acoustic emission sensor being in contact with it in fixing end；One-level sleeve external screw thread is connected with three-level internal thread of sleeve, with One-level sleeve is made to be placed in the 3rd cavity and the 4th cavity of three-level sleeve；Two-level sleeve is sleeved on the outside of three-level sleeve, two Between level sleeve and three-level sleeve, sealing ring is set.

In above-mentioned technical proposal, the sealing ring is rubber seal.

In above-mentioned technical proposal, ladder screw thread waveguide rod and fixing end are metal material, such as ferritic stainless steel.

In above-mentioned technical proposal, adhesive phase is set between fixing end and acoustic emission sensor.

In above-mentioned technical proposal, acoustic emission sensor is fixed in fixing end using magnetic clamp.

When being used, ladder screw thread the second external screw thread of waveguide rod is connected with the internal thread of sample, in the periphery of sample Coupling oxidant layer is set, the fixing end of ladder screw thread waveguide rod is rotated, so as to be connected with ladder screw thread the second external screw thread of waveguide rod The test surfaces of sample, it is concordant with the second alignment surface of the first alignment surface of one-level sleeve, three-level sleeve；Using in second sleeve Screw thread is fixedly linked with test device, and carries out electrochemical corrosion test to sample, with sample as working electrode, using wire with Ladder screw thread waveguide rod on the outside of test device is connected, to gather the electrochemical corrosion signal on sample；Sample is in corrosion During the sound emission elastic wave that sends acoustic emission sensor is reached by ladder screw thread waveguide rod and displacement signal is converted into Electric signal, outwards transmits.

A kind of corrosion electrochemical test system, including electrolytic cell, electrochemical testing device, heater and attemperator；

The electrolytic cell includes reaction tank, reaction tank lid, gasket seal, fastener, sample erecting device, the reaction Pond is cylinder, and reaction tank upper end-face edge is provided with flange, is lined with gasket seal at the top of the reaction tank lid and reaction tank, reacts Chi Gai and the logical fastener sealing of reaction tank；Air inlet pipe thread hole, exhaust pipe thread hole, auxiliary electrode spiral shell are set on reaction tank lid Pit, digital display thermometer probe screwed hole, Luggin capillary screwed hole；Air inlet pipe thread hole is connected with air inlet pipe, blast pipe spiral shell Pit is connected with blast pipe, and auxiliary electrode screwed hole is connected with described auxiliary electrode, digital display thermometer probe screwed hole and number Aobvious thermometer connection；Luggin capillary screwed hole is connected with the external screw thread of Luggin capillary liquid injection port, so that Luggin capillary Crooked position in reaction tank, just to the sample as working electrode at its opening, the internal thread of Luggin capillary liquid injection port with Reference electrode external screw thread is connected, so that reference liquid can be flow at the opening of sample in reference electrode；Luggin capillary At opening, as working electrode sample and auxiliary electrode be located at same level on；Described sample erecting device is by rank Ladder shell ripple guide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring composition, ladder screw thread waveguide rod, one-level sleeve, two Level sleeve, three-level sleeve and sealing ring are coaxially disposed, wherein：Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, In the rear end of ladder screw thread waveguide rod, fixing end is set；First external screw thread is connected with the internal thread of one-level sleeve, so that ladder spiral shell The front end of ripple guide rod is placed in first cavity and the second cavity of one-level sleeve, and the second external screw thread is placed in the second of one-level sleeve On the outside of cavity；One-level sleeve external screw thread is connected with three-level internal thread of sleeve so that one-level sleeve be placed in three-level sleeve it is the 3rd empty In chamber and the 4th cavity；Two-level sleeve is sleeved on the outside of three-level sleeve, between two-level sleeve and three-level sleeve arranges sealing ring；

The electrochemical testing device includes auxiliary electrode chuck, reference electrode chuck, working electrode chuck, electrochemistry number According to processing system；The auxiliary electrode chuck, reference electrode chuck and working electrode chuck are electric with the auxiliary on electrolytic cell respectively The fixing end of pole, reference electrode and ladder screw thread waveguide rod is connected, and is then processed with electrochemical data by signal transmssion line System is connected；

Described heater is arranged on the outside of reaction tank, and attemperator is arranged on the outside of heater, heating dress The inwall put arranges temperature sensor, for detecting the temperature change of electrolyte in reaction tank.

In above-mentioned technical proposal, the quantity of the fastener is 6～8 groups, and fastener is by " bow " shape fastener Chuck, trip bolt and fastening gasket composition, fastener chuck material are 316 austenitic stainless steels；Fastener chuck bag First level section, vertical section and the second horizontal segment are included, the second horizontal segment upper surface is provided with the thick fastening gasket for 2～3mm, tightly Be fixedly mounted with put pad material be polytetrafluoroethylene (PTFE), to prevent fastening force from causing greatly very much aquarium to rupture.

In above-mentioned technical proposal, on described reaction tank lid, stainless steel locating ring is provided with, on the stainless steel locating ring 6～8 trip bolt locating slots are evenly distributed with, a diameter of 4～5mm of trip bolt locating slot, depth are 0.5～0.6mm, tightly Gu screw locating slot is used to position described trip bolt, another effect of the stainless steel locating ring is subject to trip bolt The fastening force of applying, it is to avoid the reaction tank lid is damaged by the trip bolt.

In above-mentioned technical proposal, described air inlet pipe thread hole quantity is 3～4, exhaust pipe thread hole quantity is 1～ 2, Luggin capillary screw thread hole number is 1, and auxiliary electrode screw thread hole number is 1, digital display thermometer probe screw thread hole count Measure as 1～2；Correspondingly, air inlet pipe quantity is 3～4, and blast pipe quantity is 1～2, and Luggin capillary quantity is 1, Auxiliary electrode quantity is 1, and digital display thermometer probe quantity is 1～2；Air inlet pipe, blast pipe, Luggin capillary, auxiliary electricity Pole and digital display thermometer probe respectively at air inlet pipe thread hole, exhaust pipe thread hole, Luggin capillary screwed hole, auxiliary electrode Screwed hole, digital display thermometer probe screwed hole connect.

In above-mentioned technical proposal, described air inlet pipe and blast pipe are with externally threaded glass tube；The air inlet pipe One end is equipped with for the scattered porous foam of bubble, it is therefore an objective to the dissolving for disperseing Input gas and accelerating which in corrosive medium； The air inlet pipe be passed through high pure nitrogen or carbon dioxide or hydrogen sulfide in one kind, high pure nitrogen to corrosive medium deoxygenation, Carbon dioxide, sulfuration can simulate actual corrosive environment；The air inlet pipe thread hole not used arranges sealing screw and is sealed, The material of sealing screw is polytetrafluoroethylene (PTFE).

In above-mentioned technical proposal, described auxiliary electrode is gauze platinum electrode；Described reference electrode is arranged on Lu Jinmao In tubule, the liquid injection port of the Luggin capillary is the structure with inside and outside double thread, the Luggin capillary external screw thread and institute The Luggin capillary screwed hole connection on aquarium is stated, the Shandong gold capillary tube internal thread is led to the external screw thread of the reference electrode Helicitic texture connection is crossed, and adopts rubber seal rings for seal；Registration coupon test surfaces at the opening at the Luggin capillary tip The center of mouth, and the distance of 0.5～1mm is kept with tested sample.

In above-mentioned technical proposal, described temperature sensor quantity is 1～8；Described heater adopts resistance Heated water bath or oil bath mode are heated to electrolytic cell, temperature sensor by closed-loop policy automatically control firing rate and water or The temperature of oil, in the water that the reaction tank is put in heating and heat-insulating device or oil, the water level or oil level in heater is less than Ladder screw thread waveguide rod 2～5cm of lower end；In heater and attemperator, by arranging heating target temperature, firing rate Water or oil in the heater is heated, to be heated to after target temperature, heater stop heating, and ensure to add Water or oil in thermal maintains target temperature ± 0.1 DEG C all the time.

In above-mentioned technical proposal, ladder screw thread waveguide rod be metal material, such as ferritic stainless steel；One-level sleeve, Two-level sleeve, three-level sleeve are insulating materials, such as polytetrafluoroethylene (PTFE).

In above-mentioned technical proposal, the sealing ring is rubber seal.

When a kind of corrosion electrochemical test system is used, the internal thread of the second external screw thread of ladder screw thread waveguide rod and sample Connection, sample periphery arrange coupling oxidant layer, rotate ladder screw thread waveguide rod fixing end so that with ladder screw thread waveguide The test surfaces of the sample that the second external screw thread of bar is connected, the second alignment surface of the first alignment surface, three-level sleeve with one-level sleeve are put down Together；It is fixedly linked using the internal thread and test device of second sleeve, and electrochemical corrosion test is carried out to sample, with sample is Working electrode, is connected with the ladder screw thread waveguide rod on the outside of test device using wire, to gather the electrochemistry on sample Corrosion signal；Digital display thermometer is popped one's head in and temperature sensor detects the true temperature of electrolytic cell internal corrosion medium, test to be achieved Require temperature and test can be started after keeping stablizing.

A kind of electrochemical testing device of acoustic emission detection material corrosion performance, including electrolytic cell, electrochemical testing device, Heater and attemperator；

The electrolytic cell includes reaction tank, reaction tank lid, gasket seal, fastener, sample erecting device, the reaction Pond is cylinder, and reaction tank upper end-face edge is provided with flange, is lined with gasket seal at the top of the reaction tank lid and reaction tank, reacts Chi Gai and the logical fastener sealing of reaction tank；Air inlet pipe thread hole, exhaust pipe thread hole, auxiliary electrode spiral shell are set on reaction tank lid Pit, digital display thermometer probe screwed hole, Luggin capillary screwed hole；Air inlet pipe thread hole is connected with air inlet pipe, blast pipe spiral shell Pit is connected with blast pipe, and auxiliary electrode screwed hole is connected with described auxiliary electrode, digital display thermometer probe screwed hole and number Aobvious thermometer connection；Luggin capillary screwed hole is connected with the external screw thread of Luggin capillary liquid injection port, so that Luggin capillary Crooked position in reaction tank, just to the sample as working electrode at its opening, the internal thread of Luggin capillary liquid injection port with Reference electrode external screw thread is connected, so that reference liquid can be flow at the opening of sample in reference electrode；Luggin capillary At opening, as working electrode sample and auxiliary electrode be located at same level on；Described sample erecting device is by rank Ladder shell ripple guide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor composition, ladder screw thread waveguide Bar, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor are coaxially disposed, wherein：Ladder screw thread waveguide Bar is provided with the first external screw thread, the second external screw thread, and the first external screw thread is connected with the internal thread of one-level sleeve, so that ladder screw thread waveguide The front end of bar is placed in first cavity and the second cavity of one-level sleeve, and the second external screw thread is placed in outside the second cavity of one-level sleeve Side；Fixing end is set in the rear end of ladder screw thread waveguide rod, the acoustic emission sensor being in contact with it is set in fixing end；One-level Sleeve external screw thread is connected with three-level internal thread of sleeve, so that one-level sleeve is placed in the 3rd cavity and the 4th cavity of three-level sleeve It is interior；Two-level sleeve is sleeved on the outside of three-level sleeve, between two-level sleeve and three-level sleeve arranges sealing ring；

The electrochemical testing device includes auxiliary electrode chuck, reference electrode chuck, working electrode chuck, electrochemistry number According to processing system；The auxiliary electrode chuck, reference electrode chuck and working electrode chuck are electric with the auxiliary on electrolytic cell respectively Pole, reference electrode and ladder screw thread waveguide rod are connected, and are then connected with electrochemical data processing system by signal transmssion line；

In above-mentioned technical proposal, the sealing ring is rubber seal.

When a kind of electrochemical testing device of acoustic emission detection material corrosion performance is used, outside ladder screw thread waveguide rod second Screw thread is connected with the internal thread of sample, is arranged coupling oxidant layer in the periphery of sample, is rotated the fixing end of ladder screw thread waveguide rod, So that the test surfaces of the sample being connected with ladder screw thread the second external screw thread of waveguide rod, the first alignment surface, three-level with one-level sleeve Second alignment surface of sleeve is concordant；It is fixedly linked using the internal thread and test device of second sleeve, and electrification is carried out to sample Corrosion test is learned, with sample as working electrode, is connected with the ladder screw thread waveguide rod on the outside of test device using wire, with Electrochemical corrosion signal on collection sample；The sound emission elastic wave that sample is sent in corrosion process passes through ladder screw thread waveguide Bar reaches acoustic emission sensor and displacement signal is converted into electric signal, outwards transmits；Digital display thermometer is popped one's head in and TEMP Device coordinates the true temperature of detection electrolytic cell internal corrosion medium, test request temperature to be achieved holding start to survey after stablizing Examination.

The invention has the advantages that：

1. sound emission Dynamic Non-Destruction Measurement technology and Electrochemical Measurement Technology are integrated by the present invention, realize it is online, Dynamic, real-time detection material electrochemical corrosion process；The sample erecting device of the present invention is arranged in the side of aquarium, heating with Attemperator can be heated to corrosive medium or is incubated by water-bath or oil bath mode.

2. the tested sample of the present invention is cylindrical tiny sample, the 19～20mm of area of test surfaces², length is for only 7mm, can closely possible reduction damage of the sampling process to actual components.In addition, the present invention can realize it is micro- to actual components The sampling at little position, such as welding point zones of different (root of weld, capping, Weld pipe mill, high temperature and low temperature heat affecting etc.).

3. the sample of the present invention is installed by the way of threaded connection, and transmits corrosion sound by ladder screw thread waveguide rod Signal and electrochemical signals are penetrated, the mode conducted with wire with traditional epoxy sealing is compared, the tested sample of the present invention Installation, dismounting, clean it is all more portable and efficient.

4. the present invention includes multiple air inlet pipe, can simulate material corrosion process under Various Complex corrosive gas environments；This Invention secures the distance of Luggin capillary tip and tested sample, has unified the distance of Luggin capillary tip and tested sample Impact to test result.

5. do not limited by checked object material, as long as conductive.

6. can use in severe complicated working condition, as long as operator's remote control under safety, suitable environment , and detect that automatic degree is high, simple to operate, testing efficiency is higher, and labour intensity, testing equipment power consumption can be greatly reduced It is low, it is easy to carry, it is easy to the detection of operation field.

Description of the drawings

Fig. 1 is the electrochemical testing device workflow diagram of the acoustic emission detection material corrosion performance of the present invention；

Fig. 2 is the electrolytic cell front view of the present invention；

Fig. 3 is the electrolytic cell side view of the present invention；

Fig. 4 is the electrolytic cell top view of the present invention；

Fig. 5 is the reaction tank schematic diagram of the present invention；

Fig. 6 is the fastener schematic diagram of the present invention；

Fig. 7 is the reaction tank lid schematic diagram of the present invention；

Fig. 8 is the sample erecting device schematic diagram a of the present invention；

Fig. 9 is the profile of Fig. 8；

Figure 10 is the ladder screw thread waveguide rod schematic diagram of the present invention；

Figure 11 is the one-level sleeve schematic diagram of the present invention；

Figure 12 is the two-level sleeve schematic diagram of the present invention；

Figure 13 is the three-level sleeve schematic diagram of the present invention；

Figure 14 is the sample schematic diagram and profile of the present invention；

Figure 15 is Luggin capillary scheme of installation of the present invention；

Figure 16 is the sample erecting device schematic diagram b of the present invention；

Wherein：1 fastener；2 reaction tank gasket seals；3 temperature sensors；4 heaters；5 attemperators；6 reactions Chi Gai；7 reaction tanks；8 sample erecting devices；9 flanges；10 lateral external screw joints；

1-1 trip bolts, 1-2 first level sections, 1-3 vertical sections, 1-4 fastening gaskets, the second horizontal segments of 1-5；6-1 is fastened Screw locating slot, 6-2 stainless steel locating rings, 6-3 air inlet pipe thread holes, 6-4 digital display thermometers probe screwed hole, 6-5 auxiliary electricity Pole screwed hole, 6-6 Luggin capillary screwed holes, 6-7 exhaust pipe thread holes；6-6-1 reference electrodes, 6-6-2 Luggin capillaries, 6- 6-3 bends, at 6-6-4 openings；8-1 ladder screw thread waveguide rods, 8-2 fixing ends, 8-3 one-level sleeves, 8-4 two-level sleeves, 8-5 Three-level sleeve, 8-6 sealing rings, 8-7 samples, 8-8 acoustic emission sensors；The first external screw threads of 8-1-1, the second external screw threads of 8-1-2；8- The first alignment surfaces of 3-1, the first cavitys of 8-3-2, the second cavitys of 8-3-3,8-3-4 sealing surfaces, 8-3-5 one-level sleeve external screw threads, 8- 3-6 one-level internal thread of sleeve；8-4-1 two-level sleeve internal threads；The second alignment surfaces of 8-5-1, the 3rd cavitys of 8-5-2,8-5-3 the 4th Cavity, 8-5-4 three-level internal thread of sleeve；8-7-1 test surfaces, 8-7-2 sample peripheries, 8-7-3 sample internal threads.

Figure 17 is electrochemical corrosion polarization curve of the two phase stainless steel in the 1mol/L NaCl aqueous solution；

Figure 18 is electrochemical potentials of the two phase stainless steel in the 1mol/L NaCl aqueous solution, current density and testing time Relation curve；

Figure 19 is sound emission amplitude of the two phase stainless steel in electrochemical corrosion course；

Figure 20 is acoustic emission count of the two phase stainless steel in electrochemical corrosion course；

Figure 21 is acoustic emission energy of the two phase stainless steel in electrochemical corrosion course；

Figure 22 is two phase stainless steel in the acoustic emission waveform (in Figure 18 1 point) during cathodic polarization；

Figure 23 is acoustic emission waveform (in Figure 18 2 point) of the two phase stainless steel in process of anodic polarization；

Figure 24 is acoustic emission waveform (in Figure 18 3 point) of the two phase stainless steel in process of anodic polarization；

Figure 25 is acoustic emission waveform (in Figure 18 4 point) of the two phase stainless steel in process of anodic polarization；

Figure 26 is acoustic emission waveform (in Figure 18 5 point) of the two phase stainless steel in process of anodic polarization；

Figure 27 is acoustic emission waveform (in Figure 18 6 point) of the two phase stainless steel in process of anodic polarization.

Specific embodiment

The present invention is further illustrated with reference to the accompanying drawings and examples, but should not be construed as the limit to the present invention System.

For the sample erecting device in the sample clamp of electrochemical corrosion test, i.e. above-mentioned accompanying drawing 8, by ladder screw thread ripple Guide rod, one-level sleeve, two-level sleeve, three-level sleeve and sealing ring composition, ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, Three-level sleeve and sealing ring are coaxially disposed, wherein：Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, outside first Screw thread is connected with the internal thread of one-level sleeve, so that the front end of ladder screw thread waveguide rod is placed in the first cavity of one-level sleeve and In two cavitys, the second external screw thread is placed on the outside of the second cavity of one-level sleeve；Arrange in the rear end of ladder screw thread waveguide rod and fix End；One-level sleeve external screw thread is connected with three-level internal thread of sleeve, so that one-level sleeve is placed in the 3rd cavity of three-level sleeve and In four cavitys；Two-level sleeve is sleeved on the outside of three-level sleeve, between two-level sleeve and three-level sleeve arranges sealing ring.

In above-mentioned technical proposal, the sealing ring is rubber seal.

When being used, ladder screw thread the second external screw thread of waveguide rod is connected with the internal thread of sample, in the circumference of sample Face arranges coupling oxidant layer, rotates the fixing end of ladder screw thread waveguide rod, so as to be connected with ladder screw thread the second external screw thread of waveguide rod Sample test surfaces, it is concordant with the second alignment surface of the first alignment surface of one-level sleeve, three-level sleeve.Using second sleeve Internal thread is fixedly linked with test device, and carries out electrochemical corrosion test to sample, with sample as working electrode, using wire It is connected with the ladder screw thread waveguide rod on the outside of test device, to gather the electrochemical corrosion signal on sample.

Sample erecting device in the fixture of acoustic emission detection material corrosion performance, i.e. above-mentioned accompanying drawing 16, by ladder screw thread Waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor composition, ladder screw thread waveguide rod, Level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor are coaxially disposed, wherein：Ladder screw thread waveguide rod is provided with First external screw thread, the second external screw thread, the first external screw thread are connected with the internal thread of one-level sleeve, so that before ladder screw thread waveguide rod End is placed in first cavity and the second cavity of one-level sleeve, and the second external screw thread is placed on the outside of the second cavity of one-level sleeve； The rear end of ladder screw thread waveguide rod arranges fixing end, and the acoustic emission sensor being in contact with it is arranged in fixing end；One-level sleeve External screw thread is connected with three-level internal thread of sleeve, so that one-level sleeve is placed in the 3rd cavity and the 4th cavity of three-level sleeve；Two Level sleeve set arranges sealing ring on the outside of three-level sleeve between two-level sleeve and three-level sleeve.

In above-mentioned technical proposal, the sealing ring is rubber seal.

When being used, ladder screw thread the second external screw thread of waveguide rod is connected with the internal thread of sample, in the periphery of sample Coupling oxidant layer is set, the fixing end of ladder screw thread waveguide rod is rotated, so as to be connected with ladder screw thread the second external screw thread of waveguide rod The test surfaces of sample, it is concordant with the second alignment surface of the first alignment surface of one-level sleeve, three-level sleeve.Using in second sleeve Screw thread is fixedly linked with test device, and carries out electrochemical corrosion test to sample, with sample as working electrode, using wire with Ladder screw thread waveguide rod on the outside of test device is connected, to gather the electrochemical corrosion signal on sample；Sample is in corrosion During the sound emission elastic wave that sends acoustic emission sensor is reached by ladder screw thread waveguide rod and displacement signal is converted into Electric signal, outwards transmits.

A kind of corrosion electrochemical test system, including electrolytic cell, electrochemical testing device, heater and attemperator； The electrolytic cell includes reaction tank, reaction tank lid, gasket seal, fastener, sample erecting device, and the reaction tank is cylinder Shape, reaction tank upper end-face edge are provided with flange, are lined with gasket seal at the top of the reaction tank lid and reaction tank, reaction tank lid and anti- Ying Chitong fasteners are sealed；Air inlet pipe thread hole, exhaust pipe thread hole, auxiliary electrode screwed hole, number are set on reaction tank lid Aobvious thermometer probe screwed hole, Luggin capillary screwed hole；Air inlet pipe thread hole is connected with air inlet pipe, is vented pipe thread hole with row Tracheae connects, and auxiliary electrode screwed hole be connected with described auxiliary electrode, and digital display thermometer is popped one's head in screwed hole and digital display thermometer Connection；Luggin capillary screwed hole is connected with the external screw thread of Luggin capillary liquid injection port, so that the crooked position of Luggin capillary In reaction tank, just to the sample as working electrode, the internal thread and reference electrode of Luggin capillary liquid injection port at its opening External screw thread is connected, so that reference liquid can be flow at the opening of sample in reference electrode；At the opening of Luggin capillary, make Sample and auxiliary electrode for working electrode is located in same level；Described sample erecting device is by ladder screw thread waveguide Bar, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring composition, ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three Level sleeve and sealing ring are coaxially disposed, wherein：Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, in ladder spiral shell The rear end of ripple guide rod arranges fixing end；First external screw thread is connected with the internal thread of one-level sleeve, so that ladder screw thread waveguide rod Front end be placed in first cavity and the second cavity of one-level sleeve, the second external screw thread is placed in outside the second cavity of one-level sleeve Side；One-level sleeve external screw thread is connected with three-level internal thread of sleeve, so that one-level sleeve is placed in the 3rd cavity of three-level sleeve and In four cavitys；Two-level sleeve is sleeved on the outside of three-level sleeve, between two-level sleeve and three-level sleeve arranges sealing ring；The electricity Test chemical device includes auxiliary electrode chuck, reference electrode chuck, working electrode chuck, electrochemical data processing system；Institute State auxiliary electrode chuck, reference electrode chuck and working electrode chuck respectively with electrolytic cell on auxiliary electrode, reference electrode with And the fixing end of ladder screw thread waveguide rod is connected, and is then connected with electrochemical data processing system by signal transmssion line；It is described Heater be arranged on the outside of reaction tank, attemperator is arranged on the outside of heater, and the inwall of heater is arranged Temperature sensor, for detecting the temperature change of electrolyte in reaction tank.

In above-mentioned technical proposal, described air inlet pipe and blast pipe are with externally threaded glass tube；The air inlet pipe One end is equipped with for the scattered porous foam of bubble, it is therefore an objective to the dissolving for disperseing Input gas and accelerating which in corrosive medium； The air inlet pipe be passed through high pure nitrogen or carbon dioxide or hydrogen sulfide in one kind, high pure nitrogen to corrosive medium deoxygenation, Carbon dioxide, sulfuration can simulate actual corrosive environment；The air inlet pipe thread hole not used arranges sealing screw and is sealed, The material of sealing screw is polytetrafluoroethylene (PTFE)；

In above-mentioned technical proposal, the sealing ring is rubber seal.

A kind of electrochemical testing device of acoustic emission detection material corrosion performance, including electrolytic cell, electrochemical testing device, Heater and attemperator；The electrolytic cell includes that reaction tank, reaction tank lid, gasket seal, fastener, sample install dress Put, the reaction tank is cylinder, reaction tank upper end-face edge is provided with flange, is lined with close at the top of the reaction tank lid and reaction tank The logical fastener sealing of gasket, reaction tank lid and reaction tank；Air inlet pipe thread hole, exhaust pipe screw thread are set on reaction tank lid Hole, auxiliary electrode screwed hole, digital display thermometer probe screwed hole, Luggin capillary screwed hole；Air inlet pipe thread hole and air inlet pipe Connection, exhaust pipe thread hole are connected with blast pipe, and auxiliary electrode screwed hole is connected with described auxiliary electrode, and digital display thermometer is visited Head thread hole is connected with digital display thermometer；Luggin capillary screwed hole is connected with the external screw thread of Luggin capillary liquid injection port, so that The crooked position of Luggin capillary in reaction tank, just to the sample as working electrode, Luggin capillary fluid injection at its opening The internal thread of mouth is connected with reference electrode external screw thread, so that reference liquid can be flow at the opening of sample in reference electrode； At the opening of Luggin capillary, as working electrode sample and auxiliary electrode be located at same level on；Described sample Erecting device is made up of ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor, Ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor are coaxially disposed, wherein： Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, and the first external screw thread is connected with the internal thread of one-level sleeve, so that The front end of ladder screw thread waveguide rod is placed in first cavity and the second cavity of one-level sleeve, and the second external screw thread is placed in one-level sleeve The second cavity on the outside of；Fixing end is set in the rear end of ladder screw thread waveguide rod, the sound being in contact with it is set in fixing end and is sent out Penetrate sensor；One-level sleeve external screw thread is connected with three-level internal thread of sleeve so that one-level sleeve be placed in three-level sleeve it is the 3rd empty In chamber and the 4th cavity；Two-level sleeve is sleeved on the outside of three-level sleeve, between two-level sleeve and three-level sleeve arranges sealing ring； The electrochemical testing device includes auxiliary electrode chuck, reference electrode chuck, working electrode chuck, electrochemical data processing system System；The auxiliary electrode chuck, reference electrode chuck and working electrode chuck respectively with electrolytic cell on auxiliary electrode, reference electricity Pole and ladder screw thread waveguide rod are connected, and are then connected with electrochemical data processing system by signal transmssion line；Described adds Thermal is arranged on the outside of reaction tank, and attemperator is arranged on the outside of heater, and the inwall of heater arranges temperature Sensor, for detecting the temperature change of electrolyte in reaction tank.

In above-mentioned technical proposal, the sealing ring is rubber seal.

Electrochemistry and acoustic emission detection are carried out using aforementioned four technical scheme composition test device, it is specific as follows：

The concrete structure of the reaction tank lid refers to Fig. 7, and 3 air inlet pipe (are not drawn in figure with 1 blast pipe Go out) cover corresponding air inlet pipe thread hole and exhaust pipe thread hole connection respectively with the reaction tank, and adopt rubber seal Sealing, air inlet pipe one end are packaged with for the scattered porous foam of bubble and are inserted into reaction tank bottom, and the other end passes through rubber Pipe is connected with the gas cylinder of corresponding Input gas, and gas flow is controlled by flowmeter；Described blast pipe one end is slightly inserted into In reaction tank, it is ensured that more than corrosive medium liquid level, the other end of the blast pipe is by rubber tube and equipped with alkali lye 5L sealing volumetric flask be connected, in volumetric flask equipped with enough sodium hydroxide lyes (3L) for absorb discharge sour gas Body.All glass tubes adopt silica gel sealing with the interface of rubber tube.Saturation potassium chloride solution is filled using syringe Then the reference electrode is passed through external screw thread and institute by the Luggin capillary, it is ensured that no bubble in the Luggin capillary State Luggin capillary internal thread to be attached by helicitic texture, the reference electrode is calomel electrode, and reference liquid is saturation chlorine Change aqueous solutions of potassium.The concrete structure of the sample erecting device refers to Fig. 8 and Fig. 9, outside the second of ladder screw thread waveguide rod Appropriate vacuum grease is smeared on screw thread, to reduce corrosion acoustic emission signal decay, and rubber seal ladder screw thread ripple is enclosed within into On second external screw thread of guide rod, the then a small amount of silica gel of uniform application, afterwards derotation on the sample periphery after mechanical polishing The second external screw thread threaded connection of sample ladder screw thread waveguide rod, sample rotation is enough to after tight, start to rotate ladder spiral shell backward The sample is slowly drawn in the one-level sleeve by ripple guide rod, until sample testing face and the first alignment surface, the second alignment surface Be substantially parallel, the unnecessary silica gel being extruded then is wiped using dust-free paper, and sample testing face is repeatedly cleaned with alcohol, then Sample erecting device is put into into 24h in drying box, after silica gel is fully cured, the rubber seal two grades of sets is enclosed within into On cylinder, then the lateral external screw joint by whole sample erecting device by the two-level sleeve internal thread with reaction tank connects Connect.

The etchant solution for having configured slowly is imported in the reaction tank, is to ensure that the sample testing face is completely immersed in corruption Erosion solution in and do not spill over, it is desirable to inject reaction tank etchant solution volume be 1～1.4L.

The gasket seal of the reaction tank is enclosed within the reaction tank lid, is then put down gently on the reaction tank, adjusted The direction of the reaction tank lid makes center of the Luggin capillary tip just to the sample testing face.

6 described fasteners are installed, the fastening gasket is close to the lower limb of the flange of reaction tank first, while Trip bolt is directed at into the trip bolt locating slot on the stainless steel locating ring, institute is screwed successively using diagonal order then 6 fasteners stated.

Data collection and analysis software is opened, electro-chemical test parameter and sound emission acquisition parameter are set.The electrochemistry The setting of test parameter includes electrochemical test method and corresponding test parameter, and such as potentiodynamic polarization need to arrange open circuit electricity Position stabilization time, scanning potential range, potential scanning speed etc..The sound emission acquisition parameter is arranged includes that the signal amplifies Device multiplication factor, threshold value, sample frequency, filter range, real-time display parameters etc..It should be noted that electro-chemical test ginseng Number and sound emission acquisition parameter need according to specific sample material, corrosive environment, electrochemical test method and adjust；Then enter Accurate acoustic emission sensor described in lead experimental evaluation and the Couplings of the ladder screw thread waveguide rod of breaking of rower.In the ladder spiral shell Disconnected lead experiment is carried out on acoustic emission sensor installation end on ripple guide rod near the acoustic emission sensor, when collecting Disconnected lead acoustic emission signal amplitude to think that the acoustic emission sensor and the ladder screw thread waveguide rod are coupled when being higher than 90dB good It is good；Then, the gas cylinder valve of Input gas is opened, by flowmeter control input gas flow.

Finally, formally start experiment.To ensure as far as possible in experimentation quiet environment and avoid touch electrolytic cell and Related connection line.After the completion of test, experiment will be automatically stopped.

Believed with the polarization curve during this device to test UNS S31803 two phase stainless steel potentiodynamic polarizations and sound emission Number (electrochemical testing device：Gamry, Interface 1000, acoustic emission test device：PAC, PCI-2；Acoustic emission sensor Model：R15A；Signal amplifier model：2/4/6-AST), the NaCl aqueous solution of the test solution for 1mol/L.By this device according to After above-mentioned step is installed, opening described data collection and analysis software carries out the setting of experiment parameter.Heating target Temperature setting is 60 DEG C.Electro-chemical test parameter setting：Electrochemical test method is potentiodynamic polarization, electric potential scanning scope for- 0.75 VSCE-0.6 VSCE, sweep speed is 0.5mVSCE/s, and OCP temperature-time is 30min, setting electric current density Continue to exceed 100 μ A/cm²When, test is automatically stopped.Sound emission acquisition parameter is arranged：Signal amplifier multiplication factor is 40dB, Threshold value is 30dB, and sample frequency is 2MSPS, and filter range is 20kHz-1MHz, and Real-time Collection parameter is amplitude, energy, meter Number and waveform.

The valve of test front opening High Purity Nitrogen gas cylinder, controls high pure nitrogen with the flow velocity pair of 0.1mL/min by flowmeter Test solution carries out deoxygenation, and the deoxygenation time is 1h.Meanwhile, click begins to warm up, until solution temperature is stable 60 in electrolytic cell ±0.1℃.Afterwards, click on and start testing button, test formally starts.Test result is as shown in Figure 17-27.

Figure 17 is electrochemical corrosion polarization curve of the two phase stainless steel in the 1mol/L NaCl aqueous solution (60 DEG C).Figure 17 Polarization curve is divided into Liang Ge branches：Cathodic polarization (as indicated with 1) and anode polarization (shown in 2,3,4,5,6).Cathodic polarization process In it is main there is evolving hydrogen reaction, have bubble hydrogen to produce in specimen surface.Mainly there is the dissolving of metal, passivation in process of anodic polarization Film is formed, passivating film dissolves etc..From the beginning of corrosion potential, with the rising of current potential, metal surface gradually forms passivating film, in office Portion region passivating film can occur dissolving and produce sub- point corrosion pit, and the sub- point corrosion pit of formation is likely to repair due to being passivated again, such as 2 in Figure 17, shown in 3,4,5.When current potential exceedes pitting potential, due to the formation of stable point corrosion pit, current density can be drastically Increase, as shown in Figure 17 6.

Figure 18 is electrochemical potentials of the two phase stainless steel in the 1mol/L NaCl aqueous solution (60 DEG C), current density and survey The relation curve of examination time.

Figure 19 is sound emission amplitude of the two phase stainless steel in electrochemical corrosion course.In Figure 19,1,2,3,4,5,6 sound are sent out Penetrate amplitude corresponding with current density with 1,2,3,4,5,6 polarization potentials in Figure 16 respectively.

Figure 20 and Figure 21 is respectively acoustic emission count and energy of the two phase stainless steel in electrochemical corrosion course.Bubble hydrogen The sound emission that the acoustic emission signal amplitude of rupture generation, counting and energy form the generation of meta-stable points pit with passivation film rupture is believed Number amplitude, count and energy is without significant difference.Compared with the acoustic emission signal that meta-stable points pit is produced, stable point corrosion pit is produced Amplitude and the higher acoustic emission signal of energy, but count value significantly do not increase.

Figure 22-27 is distributed as acoustic emission waveform of the two phase stainless steel during potentiodynamic polarization, respectively correspond to Figure 17 or In Figure 19 1,2,3,4,5,6.Burst hydrogen bubbles produce typical sudden acoustic emission signal, and local is passivated film rupture and shape Mixed type acoustic emission signal is produced into point corrosion pit is stablized.This device can be realized completely while using acoustic emission and electrochemistry The purpose of technical testing material corrosion performance.

Claims

1. a kind of electrochemical testing device of acoustic emission detection material corrosion performance, it is characterised in that：Including electrolytic cell, electrochemistry Test device, heater and attemperator；The electrolytic cell include reaction tank, reaction tank lid, gasket seal, fastener, Sample erecting device, the reaction tank are cylinder, and reaction tank upper end-face edge is provided with flange, the reaction tank lid and reaction tank Top is lined with gasket seal, reaction tank lid and the logical fastener sealing of reaction tank；Air inlet pipe thread hole, row are set on reaction tank lid Gas-pipe thread hole, auxiliary electrode screwed hole, digital display thermometer probe screwed hole, Luggin capillary screwed hole；Air inlet pipe thread hole It is connected with air inlet pipe, exhaust pipe thread hole is connected with blast pipe, and auxiliary electrode screwed hole is connected with described auxiliary electrode, digital display Thermometer probe screwed hole is connected with digital display thermometer；The external screw thread phase of Luggin capillary screwed hole and Luggin capillary liquid injection port Even, so that the crooked position of Luggin capillary is in reaction tank, just to the sample as working electrode, Shandong gold capillary at its opening The internal thread of pipe liquid injection port is connected with reference electrode external screw thread, so that reference liquid can flow to opening for sample in reference electrode At mouthful；At the opening of Luggin capillary, as working electrode sample and auxiliary electrode be located at same level on；Described Sample erecting device is by ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor Composition, ladder screw thread waveguide rod, one-level sleeve, two-level sleeve, three-level sleeve, sealing ring and acoustic emission sensor are coaxially disposed, Wherein：Ladder screw thread waveguide rod is provided with the first external screw thread, the second external screw thread, and the first external screw thread is connected with the internal thread of one-level sleeve Connect, so that the front end of ladder screw thread waveguide rod is placed in first cavity and the second cavity of one-level sleeve, the second external screw thread is placed in On the outside of second cavity of one-level sleeve；Fixing end is set in the rear end of ladder screw thread waveguide rod, is arranged in fixing end and is connect with which Tactile acoustic emission sensor；One-level sleeve external screw thread is connected with three-level internal thread of sleeve, so that one-level sleeve is placed in three-level sleeve The 3rd cavity and the 4th cavity in；Two-level sleeve is sleeved on the outside of three-level sleeve, is set between two-level sleeve and three-level sleeve Put sealing ring；The electrochemical testing device includes auxiliary electrode chuck, reference electrode chuck, working electrode chuck, electrochemistry Data handling system, the auxiliary electrode chuck, reference electrode chuck and working electrode chuck respectively with electrolytic cell on auxiliary Electrode, reference electrode and ladder screw thread waveguide rod are connected, then by signal transmssion line and electrochemical data processing system phase Even；Described heater is arranged on the outside of reaction tank, and attemperator is arranged on the outside of heater, heater it is interior Wall arranges temperature sensor, for detecting the temperature change of electrolyte in reaction tank.

2. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：The quantity of the fastener is 6～8 groups, and fastener is by " bow " shape fastener chuck, trip bolt and fastening gasket Composition, fastener chuck material are 316 austenitic stainless steels；Fastener chuck includes first level section, vertical section and Two horizontal segments, the second horizontal segment upper surface are provided with the thick fastening gasket for 2～3mm, and the material of fastener pad is poly- four PVF, to prevent fastening force from causing greatly very much aquarium to rupture.

3. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：Stainless steel locating ring is provided with described reaction tank lid, 6～8 fastening spiral shells on the stainless steel locating ring, are evenly distributed with Nail locating slot, a diameter of 4～5mm of trip bolt locating slot, it is deep be 0.5～0.6mm, trip bolt locating slot is used to position institute The trip bolt stated, another effect of the stainless steel locating ring are subject to the fastening force of trip bolt applying, it is to avoid described The reaction tank lid is damaged by trip bolt.

4. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：Described air inlet pipe thread hole quantity is 3～4, and exhaust pipe thread hole quantity is 1～2, Luggin capillary screw thread hole count Measure as 1, auxiliary electrode screw thread hole number is 1, digital display thermometer probe screw thread hole number is 1～2；Correspondingly, air inlet Pipe quantity is 3～4, and blast pipe quantity is 1～2, and Luggin capillary quantity is 1, and auxiliary electrode quantity is 1, digital display Thermometer probe quantity is 1～2；Air inlet pipe, blast pipe, Luggin capillary, auxiliary electrode and digital display thermometer probe difference In with air inlet pipe thread hole, exhaust pipe thread hole, Luggin capillary screwed hole, auxiliary electrode screwed hole, digital display thermometer probe Screwed hole connects.

5. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：Described air inlet pipe and blast pipe are with externally threaded glass tube；Described air inlet pipe one end is equipped with scattered for bubble Porous foam, it is therefore an objective to the dissolving for disperseing Input gas and accelerating which in corrosive medium；The air inlet pipe is passed through high pure nitrogen Or carbon dioxide or the one kind in hydrogen sulfide, high pure nitrogen can simulate reality to corrosive medium deoxygenation, carbon dioxide, sulfuration The corrosive environment on border；The air inlet pipe thread hole not used arranges sealing screw and is sealed, and the material of sealing screw is polytetrafluoro Ethene.

6. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：Described auxiliary electrode is gauze platinum electrode；Described reference electrode is arranged in Luggin capillary, the Luggin capillary Liquid injection port is the structure with inside and outside double thread, the Luggin capillary spiral shell on the Luggin capillary external screw thread and the aquarium Pit connects, and the Shandong gold capillary tube internal thread is connected by helicitic texture with the external screw thread of the reference electrode, and adopts rubber Glue sealing ring is sealed；The center of registration coupon test surfaces mouth at the opening at the Luggin capillary tip, and protect with tested sample Hold the distance of 0.5～1mm.

7. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：Described temperature sensor quantity is 1～8；Described heater adopts resistance heating water-bath or oil bath mode to electricity Xie Chi is heated, and temperature sensor automatically controls the temperature of firing rate and water or oil by closed-loop policy, by the reaction tank In the water being put in heating and heat-insulating device or oil, the water level or oil level in heater less than ladder screw thread waveguide rod lower end 2～ 5cm；In heater and attemperator, by arranging heating target temperature, firing rate to the water in the heater It is or oil is heated, to be heated to after target temperature, heater stop heating, and ensure the water in heater or oil all the time Maintain target temperature ± 0.1 DEG C.

8. the electrochemical testing device of a kind of acoustic emission detection material corrosion performance according to claim 1, its feature exist In：A diameter of 5 ± 0.01mm of the test surfaces of sample, length are 7～8mm；Ladder screw thread waveguide rod be metal material, such as iron Ferritic stainless steel；One-level sleeve, two-level sleeve, three-level sleeve are insulating materials, such as polytetrafluoroethylene (PTFE)；The sealing ring is Rubber seal；Adhesive phase is set between fixing end and acoustic emission sensor；Using magnetic clamp by acoustic emission sensor It is fixed in fixing end.

9. a kind of electrochemical testing device of the acoustic emission detection material corrosion performance as described in claim 1～8 is in electrochemistry Application in corrosion test, it is characterised in that：Ladder screw thread the second external screw thread of waveguide rod is connected with the internal thread of sample, in sample Periphery arrange coupling oxidant layer, rotate ladder screw thread waveguide rod fixing end so that with the second outer spiral shell of ladder screw thread waveguide rod The test surfaces of the sample that line is connected, it is concordant with the second alignment surface of the first alignment surface of one-level sleeve, three-level sleeve；Using second The internal thread of sleeve is fixedly linked with test device, and carries out electrochemical corrosion test to sample, with sample as working electrode, profit It is connected with the ladder screw thread waveguide rod on the outside of test device with wire, to gather the electrochemical corrosion signal on sample；Examination The sound emission elastic wave that sample is sent in corrosion process reaches acoustic emission sensor by ladder screw thread waveguide rod and believes displacement Number electric signal is converted into, is outwards transmitted；Digital display thermometer is popped one's head in and temperature sensor coordinates detection electrolytic cell internal corrosion medium True temperature, test request temperature to be achieved holding can start test after stablizing.